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--

ket1 -- ket2
subtract the value of ket2 from ket1
we do our best to preserve categories
if one ket has a category, and the other doesn't then the result has that category
if ket1 and ket2 have different categories then return the empty ket |>
if ket1 and ket2 are 2D, then subtract them component-wise

|3> -- |5>
    |-2>

|number: 3> -- |5>
    |number: -2>

|number: 3> -- |page: 5>
    |>

|2: 5> -- |3: 7>
    |-1: -2>

arithmetic, ++ , ** , // , %% , ^^

infix type 2